To get a listing of  the full names of all users  currently logged in
and  their locations,  say "R  FINGER"  or just  "FING".   The latter
works without prior login, just  like WHO.  The column labelled  IDLE
gives the  number of  minutes since  the job was  last run  (blank if
less than 1).

If  you say "FING <pn>" or "R  FINGER ;<pn>" you will get information
only about  jobs logged in  with the  given programmer  name (1 to  3
characters).